Compressor governor



1933- c. c. FARMER 1,921,609

' COMPRESSOR GOVERNOR Original Filed Aug. 13, 1928 INVENTOR CLYDE C.FARMER ATTORNEY 1933 v 1* I 1 f 1,921,609 i UNITED STATES PATENT omen 1,921,609 v COMPRESSOR GOVERNOR 1 Clyde C. Farmer, Pittsburgh, Pa., assignor to The Westinghouse Air'irake Company, Wilmerding, Pa, a Corporation of Pennsylvania i p Application August 13. 1928, Serial No, 299.1 1

. i Renewed JanuaryZS, i933" 21 Claims. (c1. 137- 153)" This invention relates to pressure regulating applied in connection with a single regulating devices and more particularly to governors; for top type of governor. controlling the admission of steam to a fluid The governor may comprise a, steam valve Compressor or pump. i body 1, a cylinder section 2,-and a cylinder head An object of my invention is' to provide an ,3. The cylinder section 2 is provided with a 60 improved steam compressor governor which is cylindricalboss 4 which fits into an. annular simple in construction, cheap to m anu facture recess formed in the body .1 and. the section 2 andeflicient in operations is clamped to the body -1 by means of bolts 5.;

Another object of my invention is to provide ,The body 1] is provided with apartition wall an improved steam compressor governor in 6 which separates the steam, inlet chamberu'? which the parts subject to wear may bereadily from the outlet chamber 8 and is provided with removed and replaced, thus reducing the maina valve seat for a steam valve 9. The steam tenance expense to a minimum; valve 9 is carried, by a stern-10 which extends At the present time, superheated steam, at upwardly through ,a bore in a guidebushing" high pressure, is extensively-employed in 1000- '11. The bushing 11 is provided-With a circular motives and t s been nd that the heat. flange 12 whichextends into'th'e recess formed action of the steam interferes withthe proper to receive, the boss ,4 and rests upona' gasket lubrication of the steam compressor QO'VB 13, the flange 12 being clamped in place by the piston d a as a ju us ff t up n. bolts '5 when the section 2: is secured to the 2c the piston spring, and it is another object oi body 1. 4' i my invention to provide the -governor with Mounted on aireduced section .of the stem ;10' means w r the temperature of the pist nj apiston '14.. whic'n'is se curedinplace by, a chamberis prevented from rising to such ader' nut'15, and said piston works. in a slip bush- I gree as to injuriously affect the lubrication of Hg 16 having anannularffian'ge 17.. Theflange the piston or the temper of the spring. 17 extends into an annular 'recess formed at. go" Anot er O j of my ven iSIiIO p v upperface of the section ZjidlidlS clamped] a st am compressor g v n w h m a s for in place. when the head 3 is secured to the sec a t mat Ca Y centralizing the u a tion 2 by means of bolts (not showmfa gasket Springs and maintaining them Centralized.- 18 being interposedbetweenthe-clamping faces. Another objectof my invention is -to' provide 3111 ti 2;; dthehead3. U i i illating P I i of its thickness fits snugly-in the recess formed A further Object y nv on i to D inthe cylindersection2'and'for the remaindei" Vide an imp oved Sp in ,constillction in of' its'pthickness is spacedfaway from the ina; which e member po d by the i w no!" surmise of the, cylinder portion; 1 By the so prev nt a d ntalesepa a n i ring use of this construction, the bushingwill be from its support. 7 v V i I i i A Still furthe Obj of inventiim i5 0 struction facilitates "theremoval of the bushing pr v d p ov d means o pp ti a m since only; a' sliglit fiipwardjmovement of'the' 4O P OI' governor. .7 V bushing is necessary 1 for-the upperportion of .otherobiects a d advantages will am r thefiange to clearvthe top of the cylinder poi the following more detailed J description of the ti 2, h im b ghin pan :be grasped and invention. U easily-- removed. I Should thebushing be held In the a co p y i gyF iS a se fast" in the cylinder .portion due to corrosion 45 tional view taken vertically through a steam oflbyva deposipbf foreign tt t m compressor governor .embodying'my invention; .quir'e less force to. remove the bushing than Fig. 2. is a bottom View of a portion of. the if the fiangel'i would, for its'iull thickness, fit

governor; Fig. 3 is a horizontal sectional'view the recess snugly. The flange 12 of the bushtaken on the line 33 of Fig. 1; and Fig. ,4 is ing 11- is made in the'same way to facilitate the i 50 an enlarged detail sectional viewillustrating the removal'of the bushing 11 from'the :steam valve spring ring construction embodied in the regubody lli v,

lating portion of the governor. 7 The lower end of the bushing 16 is provided The steam compressor or pump governor with an'inwardly. extending flange 19.'

shown in the drawing is of the so-called double {A cup-shaped barrier plate 21 havinganan c 55 top type, but my improvements may also be nular flange 22 is mounted with the flange 22 a compressor governor having an improved reg- 'Th flange .1 7-J, f t h e 'bushingflfi fora portion 1 centered in the casing and further this cohengaging a shoulder of the section 2 and a gasket 23 is interposed between the flange 22'and the bushing 16 is provided with a plurality of holes 26 which connect the chamber within the bushing with an annular outside chamber 22., lhe section 2 is provided with openings 28 to permit-free circulation of air through the space surrounding the plate 21.

The two governor tops each comprise a spring box 29 having screw-threaded engagement in the head 3. A valve seat bushing 39, provided with an annular flange 31, is mounted below the spring box" and a flexible diaphragm 33 is mounted to engage the flange. On the opposite side of the diaphragm is a ring 32 which engages 1 formed inthe bushing 30.

the lower end of the springbox 29 so that when the spring box is screwed into place the diaphragm 33 and the seat bushing are clamped guide walls of the bushing, through which fluid under pressure supplied through passages 60 in the bushing is supplied to the chamber at one side of the flexible diaphragm 33.

,Mounted in a chamber provided in the bush-- ing 30 is a coil spring. 36 having one end in engagementwith a spring plate 37. The central portion of the spring plate is provided with a rounded depression adapted to receive the rounded end of a stem 38 carried by the valve 34.

The lower end of the spring 36 is engaged by a spring plate 39 which is held in place by a spring ring 40 mounted in an annular groove This spring plate is provided with a shoulder 54 which is preferably continuous around the plate and the under surface of this shoulder rests 'on' the spring ring 40, thus the plate is held in'place in the bushing 30. Below the shoulder 54, the plate extends through the ring 40, therebeing suincient clear ance between this portion of the plate and the ring to permit the plate to assume its proper position in assembling without binding against the ring. This clearance, however, is such that the spring ring cannot accidentally move out of ring 49 is snapped into place in the groove,

after which the plate is released and the pres sure of the spring 36 causes the plate to seat on the spring ring. With. the plate thus seated, the

ring 40 will be effectively locked against accidental movement out of its groove.

Mounted in the spring box 29 is an adjustable coil spring 41, one end of which bears on a follower plate 42 engaging the flexible diaphragm 33. The upper end of the spring engages a spring plate 43 having a concave upper face 44 which is struck on a large radius and is prefer ably in the form of a portion of a sphere. Engaging the face 44 is the end of an adjusting screw 45, the engaging face of the screw being struck on the same radius as that of the face 44. The screw 45 has screw-threaded engagement in the upper end wall of the springbox 29 and is provided at its upper end, outside of the spring box, with a head 48. A nut 47 is mounted on the'screw, to'provide for clamping the screw in its adjusted position. If in assembling the governor, the spring 41 is not mounted centrally oi the spring box, the surface 44 and the inner surface of the bolt 45 will, when the screw is turned down, cooperate to automatically centralize' the spring and will at all times tend to maintain it in its proper'position. 7

In order to relieve the steam pipes 48 and 49 of strain due to supporting the governor, a separate supporting member 50 is provided and the under face of the steam valve body 1 is provided with a centrally disposed pad 51 and bosses 52, the facesof which are in the same plane and are adapted to bear on the member 50. 'Thc bosses 52 are provided with threaded openings to receive bolts 53, by which the governor clamped to the'member 50. The heads of the bolts 5 are mounted in recesses, such that the outer faces of the bolt heads will be above the plane of the engaging faces of the bosses 52 and the pad 51.

The bushing 11 is provided with a chamber 55 which opens into a chamber 56 in the cylinder section 2 and this latter chamber is open to the atmosphere through a passage 57. Possible leak age ofsteam from the chamber 8, around the stem 10, to the chamber 55 will be free to flow to the atmosphere by way of chamber 55 and atmospheric passage 57. By this construction the chamber 58, defined by the barrier plate 21, bushing 16 and piston 14; will be substantially free from leaking steam. If steam should leak into the chamber 53, it will be .free flow to the atmosphere by way of the holes 26 inflthe bushing, chamber 27 definedby the bushing 16 and the cylinder portion 2, and atmospheric passage and pipe 59;

lay-employing the barrier plate 21', the spring 25' is prevented from contacting with the metal of the cylinder section 2 and the currents of air which pass through the openings 28' in the cylinder section and through the spacedefined by the plate and the cylinder section, prevent any considerable heat from being transmitted to the spring 25. Since the chamber 58 is substantially free from; leaking steam and is vented to the atmosphere, the temperature of "this chamber will notrise sufiicientlyto interfere with the lubrication of the piston 14.

The left hand governor top 29 is known as the low pressure top and the righthand governor top as the high pressure top. The spring 41 of the low'pressure top is responsive to a lower 1' pressure acting on its diaphragm 33 than the spring 41 of the high pressure top.

' In operation, the chamber at the underside of the diaphragm 33 of the low pressure top is suppliedwith fluid at the pressure compressed by.

the compressor into the'usual main'yreservoir (notshown) undercertain conditions, while'une spring 41 of-the low pressure governor top may, be adjusted, the left hand diaphragm 33 isgdeflected upwardly, permitting the associated valve 34 to be unseated by the pressure of spring 36.

With the left hand valve 34 thusunseated, fluid under pressure is supplied from the dia-.

phragm chamber to the piston chamber at the upper side of the piston l l, causing the. piston to operate downwardly seating .the steam valve 9 on its seat and thus closing off the further sup-' ply of steam to the compressor which causes the compressor to cease operating; v

When thefpressure of fluid in the ain reservoir' and in the left hand diaphragm chamber has been reduced below a predetermined degree,

the spring 41 of the low pressure governor top operates to deflect the left hand diaphragm 33 downwardly, so that. the valve 34,is moved to its seat. The, supply, of fluid under pressure to the piston chamber being thus cut off, the fluid pressure in said chamber leaks off to the atmos-, phere, through a restricted port in a,plug having screw-threaded connection with the cylinder head portion 3.

' The spring 25 then acts on the piston 14 to shift same upwardly, so that the steam valve 9' is again unseated, permitting the supplyof steam to-th'e compressor. The'compressor thenstarts operation to compress fluid into the main reser- V011. 1 r a 1 When fluid .from the main reservoir is supplied tothe diaphragm chamberin the high pressure governor top 29 at the right, thehigh pressure governor top then controls the operation of the compressor governor in the same manner'as the low pressure governor top functions.

, While one illustrative embodiment ofthe invention hasrbeen described in detail, it is not my intention to limit its scope to that embodiment p or [otherwise than by the terms of the appended claims.- q r "Having nowdescribed my invention, what I claim as new and desire to secure by Letters Patent, is: r :f

1. In a steam pump governor, the combination with acylinder casing, of a bushing mounted in said casing, a piston mounted in said bushing, a flange onsaid bushing resting on said casing, a barrier plate resting on said casingyand a flange on said bushing for clamping said plate to said casing. V r

2. In a steam pump governor, the combination with a cylinder casing, of a bushing mounted in said casing, a piston mounted in said bushing,

an upper outwardly extending flange on said bushing resting on said casing, a barrier plate,

' carried by said casing, a pad carried by said casand a lower inwardly extending flange on said lating the supply ofsteam to a fluid compressor, said governor having a casing, of spaced bosses ing and located between said bosses, a member only.

prising, a bushihga, regulating valve in 'said bination with avalve for controlling the supply fori supporting said governor adapted to engage said, bosses J and ;'pad, and bolts: having .z-screwthreaded-engagement in 'said bosses for clamp ing .said member to saidcasing'.

4. The combination with aagovernorlfor regulating the'supply, of steam to a fluid compressor said governor ;having. a casing, of spaced bosses extending outwardly, .from, said" casi'ng;ja pad extending", outwardly fromqsaid casing, and a supporting member. for said governor engaging said bosses and pad and secured-to said bosses '5 In a steam compressor "governor, the com binationywith a steam, valve body havinga .valve chamber, a steam valve in saidchamber, a

cylindersection'secured to said body and having,

a'pistorrchambena'piston in the chamber in said cylinder section connectedpto saidvalve,

and; a cylinder head secured to said cylindersection f mechanism. mounted in said head: for controlling thepressure of fluid on said piston; and'a spring box adapted, to secure said.,,mech'a. nism'to said cylinder head, said mechanism combushing, a springin said bushing acting o'n' said valve, a ,removable-yringymounted in a groove formedinsaid bushing, a seat-for said spring supported by said-ring and adapted to lock said ring in said bushingaf 6; In a steam compressorfgovernor, the. combination. with. a, steam. valve body having a valve chamber, a steamtvalve insaid chamber,;a cylinder section secured to said body and having a piston chamber, a piston in the chamber in said cylinder sectionconnected to said valve, and

a cylinder head secured to said cylinder section, of mechanism mounted in said head for controlling the pressure, of fluid on said piston, and a spring box adapted to ,secureisaid mechanismto said cylinderhead;saidimechanism com- 11d prising a bushing, a springseat in said bushing,

cylinder section connected 5 to said valve, and a cylinder head secured to'said cylinder section,

of mechanism mountedfiin said. head ,for .controlling thepressureof fluidin said piston, and a spring box adapted to' secure said mechanism to ,saidcylinder head, said mechanism comprising a, bushing having an annular groovejiormed therein, a ring removably mounted in said bushing within said groove, anda spring seat sup-f ring to said bushing. m l I r 8. Ina steam compressor governor, the com of steam to' the compresso -a piston for operating said valve, and means for controlling the operation of said piston, of a spring acting on one side of said piston, a barrier plate interposed between said valve and piston for supporting said spring, and a piston bushing clamp said plate in place. v 9. In a fluid pressure device, the combination with a casing having a-recess formed therein, of a slip bushing in said casing, a flange on ported on said ring and having a portion, extending through said ring adapted to lock said adapted to said bushing extending into supporting engagement'with said casing 'and being .entirely contained in said recess','the peripheral edge of said flange, for a portion of its thickness only, being adapted to engage said casing within said recess. 10. In a fluid pressure device, the combination with a casing having a recess formed therein,

of a slip bushing in said casing, a flange on said bushing extending into supporting engagement, 'with' said casing within said recess, the upper portion of the peripheral edge of said'flange being adapted to engage'said casing within said recess, and the lower portion of the peripheral edge being undercut from the upper portion.

' 11. In a fluid pressure device, the combination with a cylinder casing, of a bushing mountedin said casing, said bushing being substantially Z- shape in longitudinal section, apiston' operative in said bushing, and a barrier plate clamped between said casing and bushing for radiating heat from a chamber at one side 'of said piston to the atmosphere.

12. In a fluid pressure device, the combination with a cylinder casing, of a bushing mounted in said casing, said bushing having an outwardly extending flange in supporting engagement with said cylinder casing and having an inwardly extending flange, a piston operative in said bushing, and a barrier plateclamped between said casing and inwardly extending flange. v

13. In a fluid pressure device, the combination with a cylinder casing, of a bushing mounted in said casing, said bushing having an outwardly extending flange in supporting engagement with said cylinder casing and having an inwardly extending'flange, a piston operative in said bushing, abovesaid inwardly extending flange, and a barrier plateclamped between said casing and inwardly extending flange. r

14. In a steam pump governor, the combination with a cylinder casing, of a bushing mounted in said casing, a piston mounted in said bushing, and a barrier plate for radiating heat from a chamber at the non-pressure side of said piston to the atmosphere, said plate being clamped between said bushing and casing.

15. In a steam pump governor, thecombination with a cylinder casing, of a bushing mount tween said flange and casing;

16. In a steam pump governor, the combination with a cylinder casing, of a' bushing mounted in said casing. a piston mounted in said bushing, an inwardly extending flangeon said reagent bushing, and a barrier platefor radiating heat from a chamber at the non-pressure'side of said piston to the atmosphere, said plate being clamped between said flange and easing. I

1'7. Ina steam pump governor, the combination with a cylinder, casing, of a bushing mount ed in said casing, a piston mounted insaid bushing, and a barrier plate interposed between and engaged, by both the bushing and casing and with said bushing defining a nonpressure chamber at one side of said piston, said casing having openings-for permitting the free circulation of atmospher c air against the exterior surface of said plate and a port for connecting the non-pressure chamber to the atmosphere- 18. In a'steam pump governor, the combination with a cylinder casing having ventilating openings formed therein for permitting the free circulation of atmospheric air through the.cas-

ing, of a piston in said casing, a plate carried by said casing and defining a portion of a nonpressure chamberat one side of said piston, and a spring seated on saidplate and engagingthe non-pressure side or" said piston and constituting a cooling medium for said spring, saidplate extending. across said openings into the path of circulation of the atmospheric air.

19. In a steam pump governor, the combination with a cylinder .casing,:of a' bushing mounted in said casing, a piston mounted in said bushing, and a plate disposed below said piston and carried by said casing for radiating heat from'the non-pressure chamber at one side of the piston, said plate being held in place on the casing by said bushing, the exterior of said plate being freely exposed to the atmosphere for permitting the free circulation of atmospheric air about the plate.

20. In a'steam pump governor, the combination with a cylinder casing having ventilating openings formed therein, of a flange on said casing disposed above said openings, a bushing mounted in said casing, a piston mounted in said bushing, and a heat radiating plate clamped between said bushing and-flange'and extending downwardly across said openings.

21. In a steam pump governor, the combination with a steam valve body, a steam valve mounted in said body, a cylinder section, a pis- 1 and said piston for supporting said spring and to prevent transmission of heat from the wall to the spring. i

CLYDE C. 'FARMER.

ton mounted in said section,-a partition wall 

